here;s some interesting research that appears to suggest that Mr Trump and Mr Soros had some manner of shared interest in some real estate affair.
http://www.fromthetrenchesworldreport.com/rico-lawsuit-filed-against-george-soros-and-donald-trump/17232
I will look for confirming sources
http://www.law360.com/articles/81793/judge-won-t-enter-1-4b-judgment-against-trump